4 GB, 400 minutes and 400 texts for €4 a month.

Choose based on how much data you really use. Check your usage over the last few months.

• Zero Waste (4 GB, 400 minutes, 400 texts): if you’re mostly on wifi, for a second number or for a child’s first phone.

• Rise (8 GB, 800 minutes, 800 texts): if you chat, navigate and listen to music on the go every day.

• Boost (30 GB, unlimited calls, 100 texts): if you call a lot and need more data, for example for work on the go.

• Wild (40 GB, unlimited calls and texts): if you use a lot of data and often share your connection with your laptop.

Not sure? Start smaller. What you don’t use rolls over a month, extra data costs €1 per GB and you can switch plans every month.

Yes, and it's free. When you order, you say you want to keep your current number and give the details of your current operator. We handle the transfer.

• Enter your customer number and the SIM card number of your old operator exactly. A mistake there is the most common reason a transfer is refused.

• Your old SIM card keeps working until the transfer is done. You get a text as soon as your number is active with UNDO.

• Your old subscription ends automatically. You don't need to cancel it yourself.

You can follow the status in the app or in My UNDO, under YOUR TARIFF. As long as the box around your number is grey, the transfer is still running. Once it turns green, your number is active.

With an eSIM you're usually active within the hour. A classic SIM card is shipped within 1 working day and usually delivered by courier within 2 working days.

If you keep your number, the transfer usually takes less than 24 hours. That depends on your current operator, who has to release your number. Until then, your old SIM card keeps working.

You just keep surfing and pay €1 per extra GB, up to the out of bundle limit you set yourself. Once you reach that limit, your usage outside your bundle is blocked until the end of the month.

Often need more? Add an extra bundle in the app, from €2 a month, or switch to a bigger subscription.

No. There's no minimum contract period. You can cancel your subscription every month, and you can always take your number to another operator.

Both. When you order, you choose an eSIM or a classic SIM card. If you choose an eSIM, you enter the brand and model of your smartphone and we check right away whether your device supports eSIM.

An eSIM costs nothing extra, you get it by email and it's usually active within the hour. A classic SIM card is a multi-size SIM card: you push out the right size yourself (standard, micro or nano). Shipping it costs €5.

If you take a new number, you make an advance payment when you order:

• the price of one month of your subscription

• plus €5 if you have a classic SIM card sent to you

The advance payment is settled on your first invoice.

If you keep your current number, you don’t make an advance payment.

Cancelling takes three steps:

1. Download the cancellation form and fill it in.

2. Send it to support@undo.be.

3. We stop your number and confirm by email.

At the start of the next month you get one last invoice, for your usage and your subscription up to the day your number stops.

Taking your number to another operator? Then your UNDO subscription ends automatically once the transfer is done. You don't need to cancel anything.